Stockholders' Equity (Changes in Nonvested Stock Options) (Details) shares in Thousands	3 Months Ended
	Dec. 31, 2016 $ / shares shares
Stock-Based Compensation
Number of Options, beginning balance	2,075
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares	$ 14.90
Options granted, Number of options	0
Options vested, Number of options	(758)
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares	$ 15.24
Options forfeited, Number of options	(13)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares	$ 14.47
Number of Options, ending balance	1,304
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares	$ 14.70